Multiple cooking appliances.

[Soulsurfer]

You're right, but I've got it now. Your maths are correct, or I make the same mistake
The answer is quite different using Table A1 method, as its got 3 lots of 10A, vs only one lot when using Table A2. I think A2 is the one to use for this, just going by its name (?).

So table A2 by using the total loads, I'm getting 41.5 A after diversity ?

 

[Dave OCD]

buzz are you sparksburntout's twin or doppelganger or even his alter ego, as he never seems to bring you to task about your atrocious spelling and grammar

Hmmm you could be on to something here, another little known fact is that Tel and Pete are actually twins.

 

[telectrix]

Hmmm you could be on to something here, another little known fact is that Tel and Pete are actually twins.

not treue. pete is 4 months older than me. that,s 18 weeks to correct the minor defects and create perfection.

 

[Midwest]

You're right, but I've got it now. Your maths are correct, or I make the same mistake
The answer is quite different using Table A1 method, as its got 3 lots of 10A, vs only one lot when using Table A2. I think A2 is the one to use for this, just going by its name (?).

According to the introduction on Appendix A, Table A1 is used to calculate the current demand for a final circuit, making an allowance for diversity. Table A2 is used for calculating the current demand of an installation consisting of a number of final circuits, also making an allowance for diversity.

The 'definition' used in both (for cooking appliances) is the same (IMO), although they are written differently.

Appendix H, and H4 advises the use of Table A1 for cooker circuits in household premises. It states that a 30 or 32 A circuit is usually appropriate for household or similar cookers of a rating up to 15kW. It also advises about the connection of two or more appliances on one circuit.

Mind you, these diversity tables were composed 'hundreds' of years ago, before induction hobs, steam ovens etc were introduced. Down to the designer.

 

[telectrix]

steam ovens? are we now regressing back to the age of steam, when things were designed and engineered to perform, regardless of accountants going for cheapest option,, broken within weeks instead of decades?

 

[Midwest]

No not steam engines, steam ovens bit like this;

 

[Rpa07]

not treue. pete is 4 months older than me. that,s 18 weeks to correct the minor defects and create perfection.

18 week wonder well that's another whole topic on the forum - out with the old Electrical Trainee in with the new!

 

[Wilko]

According to the introduction on Appendix A, Table A1 is used to calculate the current demand for a final circuit, making an allowance for diversity. Table A2 is used for calculating the current demand of an installation consisting of a number of final circuits, also making an allowance for diversity ...

Re reading the docs, I see what you mean and I'm seeing the wisdom. Table A1 title has "points of utilisation or current using equipment" and in this case there are 3 of them, so apply it 3 times

Learning everyday, cheers !

 

[Soulsurfer]

Re reading the docs, I see what you mean and I'm seeing the wisdom. Table A1 title has "points of utilisation or current using equipment" and in this case there are 3 of them, so apply it 3 times

Learning everyday, cheers !

So in your opinion Wilko would you go by 3 different applications of the 10A +30% calc and cover all (15kW) on one 50A control switch or seperate radial say for one appliance and seperate isolator of course ?

 

[Midwest]

I think if you have one existing 32A radial, I'd be inclined to drag in another. If you have a butchers at H4 OSG (described by some, as a storybook with pictures), it makes reference to isolation, and refers to reg 536.2, which I can't make sense of, but think says refer to manufacturer?

 

[Wilko]

Isn't the problem that you've only got 6mm and a 32A mcb? Now I've smelt the cooking I def would not add this new hob to that circuit, a change from what I implied at 6:30 this morning ...(darn, too late to edit?). If circuit was at least 40A then it's a maybe but we are back to actual useage vs OSG advice. A 2nd 6mm and it can be Christmas every day

 

[Soulsurfer]

I think if you have one existing 32A radial, I'd be inclined to drag in another. If you have a butchers at H4 OSG (described by some, as a storybook with pictures), it makes reference to isolation, and refers to reg 536.2, which I can't make sense of, but think says refer to manufacturer?

Yes mate, I did read that and the reg which is another quite flouncy sentence and in my mind is taken as add an isolation switch to switch the appliances conveniently rather than one switch to shut off 3 different appliances for instance. Either way thanks for input from all I'm nearly off to the airport as Mallorca soon !

 

[Midwest]

I'm nearly off to the airport as Mallorca soon !

Lucky ****

 

[Rpa07]

At least take the OSG with you for lying by the pool reading material - you'll be clued up by the time you return!
Happy holiday!

Yes mate, I did read that and the reg which is another quite flouncy sentence and in my mind is taken as add an isolation switch to switch the appliances conveniently rather than one switch to shut off 3 different appliances for instance. Either way thanks for input from all I'm nearly off to the airport as Mallorca soon !

 

[Soulsurfer]

Got to get through Gatwick & out to Stansted & away first !
It's all a struggle really
Enjoy your summer chaps

 

[Soulsurfer]

Just need a postcard wall here now